Siemens SINUMERIK codes
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Siemens SINUMERIK Controller

Servo/Axis · Intermediate · 20-40 minutes

Alarm 16951

Siemens 840D 16951 - Channel search run in a program section that cannot be searched

With the language commands IPTRLOCK and IPTRUNLOCK, the part programmer can identify part program sections that cannot be searched. Every search run in these program sections will be acknowledged with alarm 16951. In other words: When the alarm appears, the user has started a search run (Serupro typ

Siemens SINUMERIKServo/AxisIntermediate20-40 minutes

16951

Siemens 840D 16951 - Channel search run in a program section that cannot be searched

Channel search run in a program section that cannot be searched

With the language commands IPTRLOCK and IPTRUNLOCK, the part programmer can identify part program sections that cannot be searched. Every search run in these program sections will be acknowledged with alarm 16951. In other words: When the alarm appears, the user has started a search run (Serupro typ

Safety

  • Refer to Siemens documentation
  • Ensure qualified technician performs repairs

Common Causes

  • Search run initiated in a program section protected by IPTRLOCK command
  • Programmer attempted to execute search function within a non-searchable code block
  • Channel pointer lock remains active from previous program execution
  • Incorrect use of IPTRUNLOCK to deactivate protected section before search operation

Troubleshooting Steps

  1. 1Review the active part program and locate IPTRLOCK/IPTRUNLOCK command pairs to identify protected sections
  2. 2Verify search run is not being initiated within a program section marked with IPTRLOCK
  3. 3Insert IPTRUNLOCK command before the desired search run location to unlock the protected section
  4. 4Check program structure to ensure IPTRUNLOCK is properly paired and positioned ahead of search operation
  5. 5Clear alarm and restart search operation after confirming program section is unlocked

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